Workaround

Disable Process offline monitoring with AMF. For detailed steps, refer to https://www.veritas.com/docs/000022623.

In AIX 7.1 TL3 SP3 (and AIX 6.1TL9 SP3),  IBM has made a fix that prohibits reading (blocks read calls) process info from the /proc//psinfo file, when a process is in EXEC state.
In AMF, we get a callback from AIX whenever a new process is placed into the EXEC state. In this context, we read the process information to match with the registered resource information for the VCS agent. This causes a deadlock, as a read call is waiting for EXEC to complete and the EXEC context is waiting on read.
 

Refer to AIX APAR IV52781 for detailed information:
IV52781: IF A PROC STOPPED BY PCSEXIT /PROC//PSINFO RETURNS ERROR. APPLIES TO AIX 7100-03
http://www-01.ibm.com/support/docview.wss?uid=isg1IV52781

Note: AMF does not function on earlier AIX releases, as well if the user applies this specific APAR.

Install the IBM APAR IV63274 on all nodes in the cluster to fix this issue:
https://www.ibm.com/support/docview.wss?uid=isg1IV63274

• AIX 7.1 TL3 SP3
• AIX 6.1 TL9 SP3

• 5.1 SP1
• 6.0
• 6.1
• 6.2